/* Copyright (c) 2009 Christoph Studer <chstuder@gmail.com>
 * Copyright (c) 2010 Jan Berkel <jan.berkel@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.klm.datakeeper.smsbackup;

import java.util.Map;
import java.util.List;
import java.util.ArrayList;
import java.util.Arrays;

import android.preference.Preference;
import android.preference.Preference.OnPreferenceChangeListener;
import android.preference.ListPreference;

public class Utils {
  private Utils() {}

  public static void initListPreference(final ListPreference pref,
                                        final Map<?, ?> fields, boolean keepExisting) {
    if (fields.size() > 0) {
      final List<CharSequence> e   = new ArrayList<CharSequence>();
      final List<CharSequence> ev  = new ArrayList<CharSequence>();

      if (keepExisting) {
        if (pref.getEntries() != null)     e.addAll(Arrays.asList(pref.getEntries()));
        if (pref.getEntryValues() != null) ev.addAll(Arrays.asList(pref.getEntryValues()));
      }

      for (Map.Entry<?, ?> entry : fields.entrySet()) {
        if (entry.getValue() != null && entry.getKey() != null) {
          e.add(entry.getValue().toString());
          ev.add(entry.getKey().toString());
        }
      }

      pref.setEntries(e.toArray(new CharSequence[e.size()]));
      pref.setEntryValues(ev.toArray(new CharSequence[ev.size()]));
    }

    pref.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
      @Override
      public boolean onPreferenceChange(Preference preference, final Object newValue) {
          pref.setTitle(
            pref.getEntries()[
              pref.findIndexOfValue(newValue.toString())
            ]);
          return true;
      }
    });

    pref.setEnabled(pref.getEntries() != null &&
                    pref.getEntries().length > 0);
  }
}
